Design, implementation, and control of a twostage ac/dc isolated power supply with high input power factor and high efficiency

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2008

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Kaya, Mehmet Can

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In this thesis a two-stage AC/DC/DC power converter is designed and implemented. The AC/DC input stage of the converter consists of the twophase interleaved boost topology employing the average current mode control principle. The output stage consists of a zero voltage switching phase shifted full bridge (ZVSPSFB) DC/DC converter. For the input stage, main design goals are obtaining high input power factor, low input current distortion, and well regulated output dc voltage, and obtaining these attributes in a power converter with high power density. For the input stage, the interleaved structure has been chosen in order to obtain reduced line current ripple and EMI, reduced power component stresses, and improved power density. The control of the preregulator is provided by utilizing a new commercial monolithic integrated circuit, which provides interleaved continuous conduction mode power factor correction (PFC). The output stage is formed by utilizing the available prototype hardware of a ZVSPSFB DC/DC converter and mainly the system integration and controller design and implementation studies have been conducted. The converter small signal model is derived and utilizing its transfer function and employing voltage loop control, the output voltage regulator has been designed. The output voltage controller is implemented utilizing a digital signal processor (DSP). Integrating the AC/DC preregulator and DC/DC converter, a laboratory AC/DC/DC converter system with high overall performance has been obtained. The overall system performance has been verified via computer simulations and experimental results obtained from laboratory prototype.

Subject Keywords

Electrical engineering.

URI

http://etd.lib.metu.edu.tr/upload/12610106/index.pdf
https://hdl.handle.net/11511/18086

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. C. Kaya, “Design, implementation, and control of a twostage ac/dc isolated power supply with high input power factor and high efficiency,” M.S. - Master of Science, Middle East Technical University, 2008.